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/* ****************************************************************************
 * fxlib/bcd.h -- fxlib's BCD numbers management.
 *
 * Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
 *
 * This file is part of the 'casiowin/fxlib' module in libcarrot, an
 * experimental modular libc project.
 *
 * This file is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 *
 * This file is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Lesser Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this file. If not, see <http://www.gnu.org/licenses/>.
 * ************************************************************************* */
#include <fxlib/cdefs.h>
#if __USE_FXLIB_UNOFFICIAL
__BEGIN_NAMESPACE_FXLIB
__BEGIN_DECLS

/* ************************************************************************* */
/*  BCD structures                                                           */
/* ************************************************************************* */
/* Storage structure */
# define bcdv_BCDval BCDval
struct tag_BCDval {
	unsigned char BCDval[9];
	unsigned char _align[3];
};
typedef struct tag_BCDval bcdval_t;
typedef struct tag_BCDval BCDVAL;

/* Internal structure (the structure that is actually used for calculations) */
# define bcd_exponent exponent
# define bcd_sign     sign
# define bcd_mantissa mantissa
struct tag_BCD {
	int exponent;
	int sign;
	int _unknown;
	char mantissa[15];
};
typedef struct tag_BCD bcd_t;
typedef struct tag_BCD BCD;
/* ************************************************************************* */
/*  Methods                                                                  */
/* ************************************************************************* */
/* BCD to internal */
extern __nonnull(1, __internal) __nonnull(2, __source)
int BCDtoInternal _OF((bcd_t *__internal, const bcdval_t *__source)) __THROW;

/* Conversions from and to unsigned int (FIXME: probably wrong prototypes) */
extern __nonnull(1, __source) __nonnull(2, __dest)
int Num_UIntToBCD _OF((const unsigned int *__source, bcd_t *__dest)) __THROW;
extern __nonnull(1, __dest) __nonnull(2, __source)
int Num_BCDToUint _OF((unsigned int *__dest, bcd_t *__source)) __THROW;

/* calculate an expression */
extern __nonnull(1, __formula) __nonnull(3, __opcode)
void CalculateExpression _OF((char **__formula, char __opcode[2],
	bcdval_t *__result, int __copyfirst)) __THROW;

/* get not a number value */
extern __nonnull(1, __value) __nonnull(2, __result)
int BCD_GetNotANumberValue _OF((const unsigned char *__value,
	unsigned char *__result)) __THROW;

__END_DECLS
__END_NAMESPACE_FXLIB
#endif